[#bsl-swap-0447]
= xref:bsl.adoc[bsl]::swap
:relfileprefix: ../
:mrdocs:

Efficiently exchange the states of the specified `a` and `b` weak pointers such that each will refer to the object (if any) and representation formerly referred to by the other.

== Synopsis

Declared in `<bslstl_sharedptr.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class ELEMENT_TYPE>
void
swap(
    xref:bsl/weak_ptr-0d.adoc[weak_ptr<ELEMENT_TYPE>]& a,
    xref:bsl/weak_ptr-0d.adoc[weak_ptr<ELEMENT_TYPE>]& b) noexcept;
----


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